code: def calc_local(self, *args, **kwargs):
      assert len(args) == 3
      return 2
  
file_path: chainer/tests/chainermn_tests/extensions_tests/test_multi_node_evaluator.py
imports: import chainer
  import chainer.testing
  from chainer.datasets import TupleDataset
  from chainer.iterators import SerialIterator
  from chainermn import create_communicator
  from chainermn.extensions import GenericMultiNodeEvaluator
label_desc: Use image node_id 2 for calling the CustomMultiNodeEvaluator obj's underlying member method code with example usage: obj.calc_local() and returns: int